Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004ap%26ss.294..225b&link_type=abstract
Astrophysics and Space Science, Volume 294, Issue 3-4, pp. 225-240
Astronomy and Astrophysics
Astrophysics
6
Techniques: Photometric, Open Clusters: Ngc 7789, Stars: Red Giant Branch, Stars: Fundamental Parameters
Scientific paper
Photoelectric Vilnius seven-color photometry is presented and analyzed for a sample of 24 red giant branch and clump stars in the open cluster NGC 7789. For each star we have determined photometric spectral type, absolute magnitude, interstellar reddening, effective temperature, metallicity, and surface gravity. From averages over the stars in the sample we find the mean reddening to the cluster E Y-V = 0.21± 0.02 (s.d.), or E B-V = 0.25, and the apparent distance modulus (m-M) V = 12.21± 0.10 (s.d.), which yield a distance of 1840 pc. The mean overall metallicity is found to be [Fe/H] = -0.18± 0.09 (s.d.). The clump stars, on average, appear to be slightly more metal-rich than the other red giants, which is most probably caused by evolutionary changes of carbon and nitrogen molecular bands falling in the photometric passbands. A difference in mass between the two groups of stars has also been detected, which suggests that the clump stars might have undergone extra mass loss before reaching their core He-burning phase of evolution.
Bartasiute Stanislava
Tautvaisiene Gražina
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